Compare side by side

Feature checklists make every tool look equivalent. This table leads with the three things that actually differ — what it costs you before it works, whether your files leave your device, and where the free version stops.

WebPageTestPageSpeed InsightsQualys SSL Labs Server TestSecurity HeadersFour is the maximum — remove one to add another.
Side-by-side comparison of WebPageTest, PageSpeed Insights, Qualys SSL Labs Server Test, Security Headers
WebPageTestwebpagetest.orgPageSpeed Insightspagespeed.web.devQualys SSL Labs Server Testssllabs.comSecurity Headerssecurityheaders.com
What it doesLoads your page from a chosen city and browser and films the resultScores a page on real-user Core Web Vitals and lab measurementsGrades a site's TLS configuration from A+ down to F and says whyGrades the HTTP security headers a site sends and names the missing ones
What it costs youNo sign-upWorks the moment the page loads. No account, no email, no trial.No sign-upWorks the moment the page loads. No account, no email, no trial.No sign-upWorks the moment the page loads. No account, no email, no trial.No sign-upWorks the moment the page loads. No account, no email, no trial.
Your filesRuns on their serverRuns on their serverRuns on their serverRuns on their server
Where it stopsFree tests sit in a shared queue at busy times, and the results need interpreting rather than reading.Field data is missing for low-traffic pages, and repeat lab runs vary by several points on unchanged code.Results appear on a public board unless you opt out, and it only tests public hosts on port 443.Checks that headers exist, not that they are correct — a permissive CSP still scores well.
Best for
  • Diagnosing a slow page properly
  • Checking load time from another country
  • Checking Core Web Vitals before a launch
  • Finding the biggest performance win
  • Verifying a TLS setup after a change
  • Diagnosing an old client that cannot connect
  • A quick hardening checklist
  • Confirming a header change deployed
CategoryWeb, Domain & NetworkWeb, Domain & NetworkWeb, Domain & NetworkWeb, Domain & Network
Last checked2026-07-292026-07-292026-07-292026-07-29
Open the siteOpenOpenOpenOpen

This comparison is in the address bar — copy the URL to send it to someone.